My computer shut off and won't come back on

When it shut off I tried to get it to come back on but I get nothing. The lights are showing inside the computer. I tried a different plug, different outlet and I get nothing. I had the power supply replaced about 3 weeks ago by someone with the company I had the extended warranty with, which is now expired. I'm not sure what else to try. The computer is 4 1/2 years old, Sony VAIO VGC-RA810G PC Desktop

Most likely your CPU is overheating. Download speedfan from this link. Speedfan monitors the temperature of your CPU. Note the temperature when the PC shuts off on its own. Let me know if this is helpful.

Sorry I misunderstood your problem. The first culprit is your power supply. Try to swap out your power supply with a know good one and see if the PC boots. Follow the chart on this website http://www.fonerbooks.com/power.htm to troubleshoot your PC.Sorry I misunderstood your problem. The first culprit is your power supply. Try to swap out your power supply with a know good one and see if the PC boots. Follow the chart on this website http://www.fonerbooks.com/power.htm to troubleshoot your PC.

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By know you should of fixed the problem .
1. keep the inside cabinet clean.
2.If the unit keeps shutting down by itself after a certain time and it is not dirty inside the cabinet .Also all the intact screens are clean . Check your Personlization settings By right clicking on your screen . then right click Screensaver and then power settings . Then check to make sure all the settings are turned off unless you want the computer to shut down after a certain amount of time

Try unplugging from wall socket then press on button (this clears out extra electricity in PC). Plug back in then try to turn on again. If PC is older, try blowing out the dust inside tower especially around the CPU fan.

It sounds like either your monitor or video card inside the computer is bad.

If the monitor is showing the "No Input Signal" message then the video
card inside the computer is bad. The monitor is ok otherwise it would
not be able to display the No Input Signal message.

When
you plug in the power cord is there any lights whatsoever on the laptop, where
the plug goes in or on the AC Adapter of the power cord?

When you press the power button do you hear fans running, hard drive spinning,
lights on the computer, hear any beeps or lights constantly blinking, hear the
DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a
second or two? If so the computer is trying to boot or may have booted,
but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with the
laptop and why it is not booting. Most times it's a motherboard issue
when you hear beeps or blinking lights continuous. Most times the problem
is with the memory or Video Card. Count the Blinking Lights or Beeps and take
note of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe you have a Static Charge
Buildup. Remove the Power Cord, then Press and Hold the power button for
30 seconds. After 30 seconds plug the power cord back in and hit the
power button to see if it boots.

Maybe
your memory is bad or the memory slot is bad.

Remove
the Power Cord, Open the Case and remove one of the memory chips. Set the
chip aside then try rebooting the computer. If it boots, then you know
the memory chip you set aside is bad so mark an x on it with an ink pen.
If it fails to boot then move the chip to the next memory slot and try
rebooting. If it fails take the chip out and set it aside, then put the
other chip in and try booting it in both slots. If it boots, just to
verify that the chip set aside is bad, mark an x on it and put it into the open
memory chip slot and try booting.

How long is shortly? If it runs and brings up the Windows Desktop and
you are allowed to work for 10 minutes or longer then it shuts down,
most likely the laptop is overheating. One way to tell if it is
overheating is to immediately try to turn it back on after it shuts off.
If it will not boot back up, it's overheating. If you let it sit and
cool off for a while, then try to boot it back up and it does it
successfully, it's overheating.Causes of Overheating:1) Dust all inside
the computer. Fans clogged with dust, dust around the vents.2) Fan not
working 3) The Thermal Past around the CPU has dried up or is too thin
the keep the unit cool.When you plug in the power cord is there any
lightswhatsoever on the laptop, where the plug goes in or on the AC
Adapter of thepower cord?

When you press the power button do you
hear fans running, hard drive spinning,lights on the computer, hear any
beeps or lights constantly blinking, hear theDvD/CD drive click and the
light on the drawer of the DvD/CD turn on for asecond or two? If so the
laptop is trying to boot or may have booted, butthe screen is not
showing for some reason.

Beep tones and blinking lights tells the
technicians what is going on with thelaptop and why it is not booting.
Most times it's a motherboard issuewhen you hear beeps or blinking
lights continuous.

This sounds like a definite power issue. This means that the problem could range from being as simple as the power button itself not working/disconnected to the power supply being dead.

Things to try:

1. Have the side of your computer open and press the power button. Notice if any fans start to move or anything that happens.

2. Do you notice the Hard drive light flashing at all when turning on?

3. Has anyone else been using or been close in proximity to the computer that could have bumped it, causing something to come loose?

4. ONLY if you feel competent enough, check the cable connections inside the computer. Make sure to disconnect from the wall for 30 seconds and reconnect before touching any cables inside. Leaving the cable connected allows the computer case itself to act as a ground to prevent static shock.